AspNetCoreBackendSSEWithPlainJavasciptEventSourceAndArrowJsReactiveDemo/TestPageUsingArrowJsReactivity_GooberFeatures.html at master · pjrusso/AspNetCoreBackendSSEWithPlainJavasciptEventSourceAndArrowJsReactiveDemo · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>SSE client using Arrow.js Reactivity and goober</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css" />
</head>
<body>
    <main class="container">
        <div class="grid">
            <div id="app"></div>
            <div>
                <table>
                    <thead>
                        <tr>
                            <th scope="col">Date</th>
                            <th scope="col">Weather</th>
                            <th scope="col">°C</th>
                            <th scope="col">°F</th>
                        </tr>
                    </thead>
                    <tbody id="tbody">
                    </tbody>
                </table>
            </div>
        </div>
    </main>

    <script type="module">
        import { reactive, html } from "https://esm.sh/@arrow-js/core";
        import { css, keyframes, glob } from "https://esm.sh/goober";
        import { createGlobalStyles } from "https://esm.sh/goober/global";

        /*
            goober feature: createGlobalStyles
            ----------------------------------
            The official goober API exposes createGlobalStyles from "goober/global".
            It is mainly designed for component-tree renderers such as React/Preact,
            where you would render <GlobalStyles /> near the top of the tree.

            This page is deliberately plain JavaScript + Arrow.js, not React/Preact,
            so the live global CSS below uses glob(...), which is the direct vanilla
            equivalent for injecting global rules.
        */
        const GlobalStyles = createGlobalStyles`
            body {
                margin: 0;
            }
        `;

        // goober feature: global styles for plain JavaScript pages.
        // Theme switching is handled using CSS custom properties on body[data-theme-mode].
        glob`
            :root {
                color-scheme: light;
                --page-bg: #f6f8fb;
                --panel-bg: #ffffff;
                --panel-border: #d7dee8;
                --text-colour: #18202a;
                --muted-colour: #5f6c7b;
                --shadow-colour: rgba(15, 23, 42, 0.12);
                --table-row-hover: #eef4ff;
                --cold-bg: #e3f2fd;
                --cold-border: #2196f3;
                --mild-bg: #e8f5e9;
                --mild-border: #4caf50;
                --warm-bg: #fbe9e7;
                --warm-border: #ff5722;
                --button-bg: #263f73;
                --button-text: #ffffff;
            }

            body[data-theme-mode="dark"] {
                color-scheme: dark;
                --page-bg: #0f172a;
                --panel-bg: #111827;
                --panel-border: #334155;
                --text-colour: #e5e7eb;
                --muted-colour: #a6adbb;
                --shadow-colour: rgba(0, 0, 0, 0.45);
                --table-row-hover: #1e293b;
                --cold-bg: #102a43;
                --cold-border: #60a5fa;
                --mild-bg: #123524;
                --mild-border: #4ade80;
                --warm-bg: #431b12;
                --warm-border: #fb923c;
                --button-bg: #7dd3fc;
                --button-text: #082f49;
            }

            html, body {
                min-height: 100%;
            }

            body {
                background: var(--page-bg);
                color: var(--text-colour);
                transition: background 220ms ease, color 220ms ease;
            }

            main.container {
                padding-top: 2rem;
            }

            h2 {
                display: flex;
                gap: 0.65rem;
                align-items: center;
                margin-bottom: 0.35rem;
            }

            ul {
                list-style: none;
                padding-left: 0;
            }

            table {
                background: var(--panel-bg);
                border: 1px solid var(--panel-border);
                border-radius: 14px;
                overflow: hidden;
                box-shadow: 0 8px 22px var(--shadow-colour);
            }

            th, td {
                color: var(--text-colour);
            }
        `;

        // goober feature: reusable keyframe animations.
        const pulseGlow = keyframes`
            0%, 100% {
                transform: scale(1);
                filter: brightness(1);
            }
            50% {
                transform: scale(1.12);
                filter: brightness(1.25);
            }
        `;

        const slideIn = keyframes`
            from {
                opacity: 0;
                transform: translateY(8px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        `;

        const weatherIconBounce = keyframes`
            0%, 100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-3px);
            }
        `;

        const state = reactive({
            connected: false,
            theme: localStorage.getItem("weather-demo-theme") || "light",
            forecasts: []
        });

        document.body.dataset.themeMode = state.theme;

        function toggleTheme() {
            state.theme = state.theme === "light" ? "dark" : "light";
            document.body.dataset.themeMode = state.theme;
            localStorage.setItem("weather-demo-theme", state.theme);
        }

        function getWeatherIcon(forecast) {
            const summary = (forecast.Summary || "").toLowerCase();
            const temp = forecast.TemperatureC;

            if (summary.includes("freezing") || temp <= 0) return "❄️";
            if (summary.includes("chilly") || summary.includes("cool") || temp < 10) return "🧥";
            if (summary.includes("mild")) return "🌤️";
            if (summary.includes("warm") || summary.includes("balmy")) return "☀️";
            if (summary.includes("hot") || summary.includes("sweltering") || summary.includes("scorching") || temp >= 28) return "🔥";

            return "🌡️";
        }

        function getTemperatureBand(forecast) {
            if (forecast.TemperatureC < 10) return "cold";
            if (forecast.TemperatureC < 20) return "mild";
            return "warm";
        }

        const classCache = new Map();

        function cachedClass(key, factory) {
            if (!classCache.has(key)) {
                classCache.set(key, factory());
            }

            return classCache.get(key);
        }

        const panelClass = css`
            background: var(--panel-bg);
            border: 1px solid var(--panel-border);
            border-radius: 14px;
            padding: 1rem;
            box-shadow: 0 8px 22px var(--shadow-colour);
        `;

        const toolbarClass = css`
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 0.75rem;
            margin-bottom: 0.75rem;
        `;

        const themeButtonClass = css`
            border: 0;
            border-radius: 999px;
            background: var(--button-bg);
            color: var(--button-text);
            padding: 0.45rem 0.75rem;
            cursor: pointer;
            font-size: 0.9rem;
            width: auto;

            &:hover {
                transform: translateY(-1px);
                box-shadow: 0 6px 14px var(--shadow-colour);
            }
        `;

        const mutedTextClass = css`
            color: var(--muted-colour);
            margin-top: 0;
        `;

        const emptyStateClass = css`
            color: var(--muted-colour);
            border: 1px dashed var(--panel-border);
            border-radius: 12px;
            padding: 0.85rem;
            margin-top: 1rem;
        `;

        const iconClass = css`
            display: inline-block;
            font-size: 1.5rem;
            animation: ${weatherIconBounce} 900ms ease-in-out infinite;
        `;

        function ledClass(connected) {
            return cachedClass(`led-${connected}`, () => css`
                display: inline-block;
                width: 18px;
                height: 18px;
                border-radius: 50%;
                position: relative;
                border: 1px solid rgba(0,0,0,0.4);
                background: ${connected
                    ? "radial-gradient(circle at 30% 30%, #aaffaa 0%, #55ff55 20%, #11bb11 60%, #006600 100%)"
                    : "radial-gradient(circle at 30% 30%, #ffaaaa 0%, #ff5555 20%, #cc1111 60%, #770000 100%)"};
                box-shadow: ${connected
                    ? "inset 0 -2px 4px rgba(0,0,0,0.35), inset 0 2px 4px rgba(255,255,255,0.2), 0 0 10px #00ff00, 0 0 20px rgba(0,255,0,0.6)"
                    : "inset 0 -2px 4px rgba(0,0,0,0.35), inset 0 2px 4px rgba(255,255,255,0.2), 0 0 10px #ff0000, 0 0 20px rgba(255,0,0,0.6)"};
                animation: ${connected ? `${pulseGlow} 1.4s ease-in-out infinite` : "none"};

                &::before {
                    content: '';
                    position: absolute;
                    top: 2px;
                    left: 3px;
                    width: 8px;
                    height: 5px;
                    border-radius: 50%;
                    background: rgba(255,255,255,0.75);
                    transform: rotate(-20deg);
                }
            `);
        }

        function forecastClass(forecast) {
            const band = getTemperatureBand(forecast);

            return cachedClass(`forecast-${band}`, () => css`
                padding: 10px;
                margin-bottom: 8px;
                border-left: 6px solid var(--${band}-border);
                background: var(--${band}-bg);
                border-radius: 10px;
                animation: ${slideIn} 240ms ease-out both;
                transition: transform 180ms ease, box-shadow 180ms ease, background 220ms ease;

                &:hover {
                    transform: translateX(8px);
                    box-shadow: 0 6px 16px var(--shadow-colour);
                }
            `);
        }

        function tableRowClass(forecast) {
            const band = getTemperatureBand(forecast);

            return cachedClass(`table-row-${band}`, () => css`
                border-left: 5px solid var(--${band}-border);
                animation: ${slideIn} 240ms ease-out both;

                &:hover {
                    background: var(--table-row-hover);
                }
            `);
        }

        const alignCentreClass = css`
            text-align: center;
        `;

        const alignRightClass = css`
            text-align: right;
        `;

        function addSampleForecast() {
            const samples = [
                { Date: "2026-05-23", TemperatureC: 6, TemperatureF: 43, Summary: "Chilly" },
                { Date: "2026-05-24", TemperatureC: 15, TemperatureF: 59, Summary: "Mild" },
                { Date: "2026-05-25", TemperatureC: 24, TemperatureF: 75, Summary: "Warm" },
                { Date: "2026-05-26", TemperatureC: 30, TemperatureF: 86, Summary: "Hot" }
            ];

            state.forecasts.push(samples[state.forecasts.length % samples.length]);
        }

        const view = html`
            <div class="${panelClass}">
                <div class="${toolbarClass}">
                    <div>
                        <h2>
                            Weather stream
                            <span class="${() => ledClass(state.connected)}"
                                  title="${() => state.connected ? "Connected" : "Disconnected"}"></span>
                        </h2>
                        <p class="${mutedTextClass}">
                            ${() => state.connected ? "Connected to SSE" : "Disconnected from SSE"}
                        </p>
                    </div>

                    <button type="button" class="${themeButtonClass}" @click="${toggleTheme}">
                        ${() => state.theme === "light" ? "Dark mode" : "Light mode"}
                    </button>
                </div>

                <button type="button" class="${themeButtonClass}" @click="${addSampleForecast}">
                    Add sample forecast
                </button>

                ${() => state.forecasts.length === 0
                    ? html`<p class="${emptyStateClass}">Waiting for weather events...</p>`
                    : html`
                        <ul>
                            ${() => state.forecasts.map(forecast => html`
                                <li class="${forecastClass(forecast)}">
                                    <span class="${iconClass}">
                                        ${getWeatherIcon(forecast)}
                                    </span>

                                    <strong>${forecast.Date}</strong>

                                    ${forecast.TemperatureC}°C
                                    /
                                    ${forecast.TemperatureF}°F

                                    ${forecast.Summary ? `- ${forecast.Summary}` : ""}
                                </li>
                            `)}
                        </ul>
                    `}
            </div>
        `;

        view(document.getElementById("app"));

        const tableBody = html`
            ${() => state.forecasts.map(forecast => html`
                <tr class="${tableRowClass(forecast)}">
                    <td>${forecast.Date}</td>
                    <td class="${alignCentreClass}">${getWeatherIcon(forecast)}</td>
                    <td class="${alignRightClass}">${forecast.TemperatureC}°C</td>
                    <td class="${alignRightClass}">${forecast.TemperatureF}°F</td>
                </tr>
            `)}
        `;

        tableBody(document.getElementById("tbody"));

        const source = new EventSource("https://localhost:7017/weatherforecastevents");

        source.onopen = () => {
            state.connected = true;
        };

        source.onerror = () => {
            state.connected = false;
        };

        source.addEventListener("weather", event => {
            const forecast = JSON.parse(event.data);
            state.forecasts.push(forecast);
        });
    </script>
</body>
</html>